Fan speed control device

Details Fan speed control device Fan speed control device

2008-01-17

2009-11-10

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

Reexamination Certificate

active

07615946

ABSTRACT:
A fan speed control device includes a management selection module, a first and a second buffers, a resistor, a transistor, and a switch. Depending upon whether a motherboard supports a system of a baseboard management control or not, the fan speed control device selectively uses an indicative signal of a serial input and output interface or an indicative signal of the baseboard management control to indicate a power-on status. At the power-on moment, the fan speed control device controls the fan to operate at its minimum speed, so that a system crash due to a power output shortage of a power supply can be avoided. As the system enters stable operation, the fan speed is controlled by a pulse width modulation signal.

REFERENCES:
patent: 6545438 (2003-04-01), Mays, II
patent: 6650074 (2003-11-01), Vyssotski et al.
patent: 7218073 (2007-05-01), Huang et al.
patent: 7233121 (2007-06-01), Wu et al.
patent: 7545112 (2009-06-01), Wu et al.

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